Improvement in piston-packings



H. P. MCCARROLL Y lmprovement'in PistonPackng'.

N0. 126,888. I P'artevnted'Npv. 14,1871.

PATENT OFFICE.

HERSCHEL P. MCOARROLL, 0F PITTSBURG, PENN SYLVANI.

IM PROVEMENT IN PISTON-PACKINGS.

Specification forming part of Letters Patent No. 120,888, dated November 14, 1871.

To all whom it may concern:

Be it known that I, HEEscEEL P. McCAR- ROLL, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and Improved Piston-Packing 5 and I do hereby declare that the following is' a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawing formin g a part of this specification, in which- Figure l represents a transverse section of my improved piston-packing on the line o c, Fig. 2. Fig. 2 is a longitudinal section of the same on the line 7c lc, Fig. l.

Similar letters ofreferenee indicate corresponding parts.

This invention relates to the use of a cont-inuously self-acting expansion spring within the ordinar-ypacking-sprin g of a steam-en gine or pumppiston, and to a new arrangement of interior steady-pins, as hereinafter more fully described.

A in the drawing represents the piston-rod, B and (l are the pistonheads, D is the packingspring, and E a portion of the cylinder within which the pistou works. One of the heads B has a projecting ring, a, against which the head C rests. Between this ring a and the packingspring D is interposed a coiled spring, F, which bears with constant pressure against the spring D and counteracts the contracting efforts of the same. The power of the springs D F will always be balanced, for the latter becomes weaker as the former is enlarged, and consequently also weakcned. In this manner an equal pressure on all points ofthe packing-spring is sustained. To the inner side of the ring a is secured a series of springs, b b, which are, by jointed links d d, connected with radial steady-pins e e. These pins lit through the ring c and bear, by the power of the springs b, against the inner face of the spring F, as is clearly shown in Fig. 1. The pins c serve to steady the coiled spring and make it act uniformly against the packing-spring.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The circular and expansive spring F, when combined with the ring D, springs b, and pin c, as and for the purpose specified.

2. The steady-pins e applied by the pressure of the springs b against the inner periphery ofthe coiled spring F, as specified.

- HERSCHEL P. MCGARROLL. Witnesses:

JOHN L. McUAREoLL,

GEORG W. CRAFT. (151) 

